Interestingly however, future Sandy-like storms may be classified differently, at least in terms of how watches and warnings are issued:

[T]he NWS is exploring two proposals that, if adopted, would result in some changes to NWS products and warnings. The first proposal originates from the unique situation posed by Hurricane Sandy; it would give the NHC the option to continue issuing formal advisories on post-tropical cyclones as long as those systems pose a significant threat to life and property, and it would give the NWS the option to keep hurricane and tropical storm watches and warnings in place for those systems.

The second proposal focuses on developing an explicit warning product for storm surges.

If NWS adopts the first proposal, then it would mean that a future storm identical to Sandy in every respect would trigger the so-called "hurricane deductible" for insurance policies that are based on the issuance of a hurricane warning in the affected state. So from the perspective of insurance, Sandy was not a hurricane but a future Sandy might well be. Homeowners and insurance companies take note.